Battery

Abstract

A body has a liquid-activatable powder mixture disposed in a metal casing with a first end that extends towards a second end longitudinally and includes at least one perforation, a conductive rod with a first end located adjacent and beyond the first end of the metal casing and extends towards the second end in contact with the powder mixture, a permeable separator, disposed between the liquid-activatable powder mixture and the metal casing, for electrically isolating the negative electrode from the positive electrode while being permeable to liquid useful in activating the powder mixture, and a passage, extending from the perforation of the metal casing through the permeable separator, for allowing a flow of liquid to activate the liquid activatable powder mixture. The metal casing is moveable relative to at least the body between a first position to expose and a second position to conceal the perforation on the metal casing.

1 . A battery comprising:
 a body having opposite first and second ends;   a liquid-activatable powder mixture disposed in the body;   a negative electrode, at which anions are oxidized, comprising a metal casing which has a first end that extends towards a second end longitudinally and includes at least one perforation;   a positive electrode, to which cations migrate, comprising a conductive rod which has a first end located adjacent and beyond the first end of the metal casing and that extends towards the second end of the body in contact with the powder mixture;   a permeable separator, disposed between the liquid-activatable powder mixture and the metal casing, for lining the perforation and electrically isolating the negative electrode from the positive electrode while being permeable to liquid useful in activating the powder mixture; and   a passage, extending from the perforation of the metal casing through the permeable separator, for allowing a flow of liquid to activate the liquid activatable powder mixture,   wherein the metal casing is moveable relative to at least the body between a first position to expose and a second position to conceal the perforation on the metal casing.   
     
     
         2 . The battery as claimed in  claim 1 , wherein the first end of the body and the first end of the metal casing are sealed by a first end cap. 
     
     
         3 . The battery as claimed in  claim 2 , wherein the body and the metal casing are separated by a further casing positioned therebetween and with first and second ends. 
     
     
         4 . The battery as claimed in  claim 3 , wherein the further casing includes an opening which extends between the first and second ends and is aligned with the perforation on the metal casing, the further casing and the metal casing is moveable relative to the body between the first position to expose and the second position to conceal the opening on the further casing and the perforation on the metal casing. 
     
     
         5 . The battery as claimed in  claim 3 , wherein the first end cap is provided with the first end of the further casing. 
     
     
         6 . The battery as claimed in  claim 5 , wherein the first end cap of the further casing is integrally formed with the first end of the further casing. 
     
     
         7 . The battery as claimed in  claim 1 , wherein the metal casing is movable between the first and second positions by sliding along an axis extending longitudinally through the first and second ends of the body. 
     
     
         8 . The battery as claimed in  claim 7 , wherein the further casing and the metal casing are arranged to have their relative position fixed by an inter-engagement means such that the further casing and the metal casing are slidable between the first and second positions in unison. 
     
     
         9 . The battery as claimed in  claim 8 , wherein the first end of the further casing is releasably coupled by a coupler to the first end of the body when the further casing is at the second position. 
     
     
         10 . The battery as claimed in  claim 9 , wherein the coupler includes a pair of complementary threaded engagements on the respect first ends of the body and the further casing. 
     
     
         11 . The battery as claimed in  claim 10 , wherein the coupler when engaged forms a waterproof coupling. 
     
     
         12 . The battery as claimed in  claim 11 , wherein the coupler further includes a sealed ring positioned adjacent the threaded engagement on the further casing. 
     
     
         13 . The battery as claimed in  claim 1 , wherein the second end of the metal casing is retained at least partially within the body by a retainer when the metal casing is moved to the second position. 
     
     
         14 . The battery as claimed in  claim 13 , wherein the retainer comprises a releasable complementary threaded coupler at the second end of the metal casing and the first end of the body. 
     
     
         15 . The battery as claimed in  claim 8 , wherein the second end of the further casing is retained at least partially within the body by a retainer when the further casing is moved to the second position. 
     
     
         16 . The battery as claimed in  claim 15 , wherein the retainer comprises a releasable complementary threaded coupler at the second end of the further casing and the first end of the body. 
     
     
         17 . The battery as claimed in  claim 8 , wherein the inter-engagement means includes a pair of projections on the second end of the metal casing insertable into a pair of seats on the second end of the further casing. 
     
     
         18 . The battery as claimed in  claim 17 , wherein the pair of seats comprises a pair of indentations on the second end of the further casing. 
     
     
         19 . The battery as claimed in  claim 18 , wherein the projection is of a shape corresponding to that of the indentation such that they form a close-fit. 
     
     
         20 . The battery as claimed in  claim 4 , wherein the number of opening on the further casing correspond to the number of perforation on the metal casing. 
     
     
         21 . The battery as claimed in  claim 1 , wherein the metal casing comprises at least two perforations, the permeable separator that lines the perforations comprises a visual indicator at each position of the perforations for indicating passing of liquid there through. 
     
     
         22 . The battery as claimed in  claim 14 , wherein the threaded coupler when coupled maintains the metal casing at the second position. 
     
     
         23 . The battery as claimed in  claim 16 , wherein the threaded coupler when coupled maintains the further casing at the second position. 
     
     
         24 . The battery as claimed in  claim 22 , wherein the threaded coupler includes a stopper to prevent rotation of the metal casing relative to the body. 
     
     
         25 . The battery as claimed in  claim 23 , wherein the threaded coupler includes a stopper to prevent rotation of the further casing relative to the body.